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Electric rotary machineElectric rotary machine description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20060138876, Electric rotary machine. Brief Patent Description - Full Patent Description - Patent Application Claims
BACKGROUND OF THE INVENTION [0001] The present invention relates to a electric rotary machine having a cooling mechanism for cooling heat generated from the coil end portion of a stator (that is, a stator coil). [0002] As disclosed in JP-A-10-51989, there is proposed a method wherein heat conductive resin is filled between the coil end portion of a stator and a frame (or a casing) and further metal material having a heat conductivity larger than that of the heat conductive resin is also inserted therein thereby to improve heat dissipation efficiency. [0003] In the electric rotary machines such a generator for a vehicle which are required to be small in size and high in output, as disclosed in JP-A-2000-209813, a cooling medium path is formed at a frame portion thereof thereby to flow cooling medium therethrough and silicon resin is filled between the coil end portion of a stator (or a stator coil) and a frame (or a casing). SUMMARY OF THE INVENTION [0004] The conventional technique disclosed in JP-A-10-51989 has problems that since the heat conductive member made from metal material is fit into the both end portions of the frame, the number of manufacturing procedures of the machine increases, the productivity thereof degrades and the cost thereof rises due to the increase of the constituent elements thereof. [0005] The conventional technique disclosed in JP-A-2000-209813 has a problem that the manufacturing workability of the machine is bad since the configuration of the cooling medium path is complicated. Further, since the silicon resin which linear thermal expansion coefficient is larger by one-digit or more than those of the material of the core, the coil of the stator and the frame is used as the heat conductive filling resin, the filling resin expands in the inner diameter side at the time of high temperature and so contacts with the rotor. Further, there arise problems that due to the difference of the thermal expansion coefficients, an excessive stress is generated between the frame and the filling resin and so stress is generated repeatedly at the frame and the stator coil. Furthermore, there arises a problem that since the silicon resin is expensive, the manufacturing cost of the machine arises. [0006] Accordingly, in view of the aforesaid problems of the conventional techniques, an object of the present invention is to provide a electric rotary machine which can surely perform heat conduction between a stator coil and a frame without increasing the number of parts, increase heat dissipation efficiency of the stator coil, suppress the generation of stress between the frame, the coil and filling resin and improve the reliability of the electric rotary machine. [0007] Another object of the present invention is to obtain the frame of a electric rotary machine which is good in assembling workability. [0008] In order to attain at least one of the aforesaid objects, the present invention is configured by at least one of the following configurations. [0009] 1. In the case where a electric rotary machine frame is made from aluminum and provided with a cooling medium path surrounding the outer periphery of a stator, unsaturated polyester resin having a linear thermal expansion coefficient equal to or larger than that of aluminum is filled between the stator and the electric rotary machine frame. [0010] 2. In a electric rotary machine which includes the electric rotary machine frame provided with the cooling medium path at the outer periphery of the stator and in which insulation resin is filled between the electric rotary machine frame and the stator, grooves as a resin capture means are formed at the junction surface between the insulation resin and the electric rotary machine frame. [0011] 3. In the electric rotary machine including the stator formed by a bowl-shaped electric rotary machine frame, a cylindrical stator core and a stator coil wound around the cylindrical stator core and having coil end portions at the both sides of the cylindrical stator core, the stator core is fit into and fixed to the inner wall of the bowl-shaped electric rotary machine frame, and the coil end portions is molded and fixed by resin material at the inside of the frame, wherein a cavity is formed at the bowl-shaped electric rotary machine frame so as to cover the end coil portions of the stator coil and the outer periphery of the stator core, and cooling medium passes through the cavity. [0012] 4. The electric rotary machine frame is formed by an inner side frame and an outer side cylindrical frame, wherein the inner side frame is formed in a bowl shape in a manner that one side thereof is opened and the other side thereof has a bottom portion and a stator is fixed to the inner periphery thereof, the outer side cylindrical frame forms an outer frame of the electric rotary machine, the inner side frame and the outer side cylindrical frame are constituted as an integrally molded component which are coupled at portions in opposite to the bottom portions thereof, and a cavity is formed between the inner side frame and the outer side cylindrical frame. [0013] 5. The electric rotary machine frame is made from aluminum, formed in a bowl shape in a manner that one side thereof is opened and the other side thereof has a bottom portion and formed with a cylindrical cavity portion which is configured in a manner that the bottom portion side is opened between the inner periphery and the outer periphery of the frame and the opened side is closed, and cooling medium us injected into the cavity potion of the frame. The electric rotary machine further includes a sealing member attached to the opened side of the cavity portion to hermetically seal the opened end, a bracket attached to the opened end side of the bowl shaped frame and provided with a bearing at the center thereof, another bearing fixed at the center portion of the bottom portion of the bowl-shaped frame, and a rotor pivotally supported between the bearings. [0014] Preferably, the bracket is fixed to the end surface of the frame by means of a screw. [0015] Preferably, another bracket covering the outside of the sealing member is attached to the end portion of the sealing member at a side in opposite to the bracket side thereof, and a brush is disposed between the another bracket and the sealing member. BRIEF DESCRIPTION OF THE DRAWINGS [0016] FIG. 1 is a sectional diagram showing an embodiment of the electric rotary machine according to the present invention; [0017] FIG. 2 is an enlarged diagram showing a part of the electric rotary machine of FIG. 1; and [0018] FIG. 3 is a sectional diagram showing the structure of an output terminal of FIG. 1. DETAILED DESCRIPTION OF THE INVENTION [0019] The basic configuration of the electric rotary machine according to an embodiment of the present invention will be explained with reference to the accompanying drawings. [0020] The electric rotary machine includes a bowl-shaped frame 2. Continue reading about Electric rotary machine... Full patent description for Electric rotary machine Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Electric rotary machine patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Electric rotary machine or other areas of interest. ### Previous Patent Application: Ventilation apparatus Next Patent Application: Low profile d.c. brushless motor for an impeller mechanism or the like Industry Class: Electrical generator or motor structure ### FreshPatents.com Support Thank you for viewing the Electric rotary machine patent info. 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